To my knowledge, SWF files are processed locally (on the computer) via a plugin used on whatever browser a user happens to be using so it is less likely that the problem is server side issue with the SWF.
However, it has been my understanding that any .PHP file does require server side applications to work properly...so there could be some compatibility issues on your host's end of things.
If you send me links to working versions of the files as well as links to the non-working ones I can try them on my end just to see what happens. Also, deleting cookies and temp files are everybody's best friend when troubleshooting web pages that don't load properly too


